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January 30, 2015

January 30, 2015

Posted by **Hope** on Monday, January 3, 2011 at 9:18am.

Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5?

1) commutative property of addition

2) distributive property

3) additive identity

4) additive inverse

Please help me

- Math -
**Reiny**, Monday, January 3, 2011 at 9:46amThey clearly want you to mentally group the numbers into

27+3 + 15+5 to quickly in your head find 20+20=40

Now which property lets you do something like

a+b = b+a ?

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